FIX: Mac semi-translucent colors & suppress dialog flicker during system picker

• Official filament picker now renders semi-transparent colors correctly on macOS.
• Disables the flicker prompt while the default system color picker is open.

jira: STUDIO-13452

Change-Id: I6a83d3cf488114f92813e378b507f293d7c4254e
(cherry picked from commit 4cd2c47f99f956681f41a1af0343efc9ad377684)

src/slic3r/GUI/FilamentPickerDialog.cpp

@@ -625,9 +625,15 @@ void FilamentPickerDialog::BindEvents()
     // Bind more colors button event
     if (m_more_btn) {
         m_more_btn->Bind(wxEVT_BUTTON, [this](wxCommandEvent&) {
+            // Pause click detection while color picker is open
+            StopClickDetection();
+
             wxColourData original_data = GetSingleColorData();
             wxColourData result = show_sys_picker_dialog(this, original_data);
 
+            // Resume click detection after color picker closes
+            StartClickDetection();
+
             // Check if user actually selected a different color
             if (result.GetColour() != original_data.GetColour()) {
                 wxColour selected_color = result.GetColour();